Stoker furnace



July 10, I923.

H- A. POPPENHUSEN STOKER FURNACE Filed Dec. 14 1921 3 Shuts-Sheet l i 1I Jamar 1%W/ffi Q M 2/ima July 10, 1923.

H. A. POPPENHUSEN STDKER FURNACE Filed Dec. 14. 1921 5 Sheets-Sheet 2July 10, 1923.

H. A. POPPENHUYSEN Toallwhamitm ityofseparate supply conduits for t p1,461,450 PATENT OFFICE.

:1: moooxrm, 03m! CHICAGO,

mom ironmon.

A umm fled lumber 14,180.. seen no. men.

comm. Be it known'the t if'mamn UnitedS mg at l'dnmmoniili the county ofState of Indiana, have invented new and useful Impro in Stoker Furnaces,of

which the, followingis a specification.

invention relates to furnaces, and more pmicnla'rlyto furnaces equippedwith mechanical cookers, such as chain grates, and provided withvertical air ducts-at the sides of the grate for supplying the activegrate do- .surfoce from below with a forced dra livered to-the gratebetween the top and hot tom leads thereof.

One object of my invention is to provide for .the vertical air ducts atthe sides of the grate, a main air supp] conduit, common to all of saidvertical note, for avoiding the expense of buildin'gend use of a lure 656% oral vertical ducts as heretofore, and further for delivering asubstantially steady and continuous flow of air to the grate by beingable: to maintain for all of the vertical ducts, regardless of theirnumber, a substantially constant pressure in the main supply conduit.

Another obj'ectof my invention is to make the vertical ducts the allwidth of the com- .partments. between the rote leads-and into whichthese ducts open For giving a full and adequate supply of draft to theentire grate surface covering. the compartments, and. thus gain an,eflicient and economical cornbustion of the fuel being carried on thefurther object of my invention is to urrange the main supply conduitbetween the vertical ducts at the opposite sides of the grate and haveall-of said ducts open mto said conduit so that the latter'mny belocated in the furnace setting between the side walls thereof andbeneath the grnto, thus retaining all of the draft supplying structurewithin the confines of the furnace and not rejecting beyond the sidesthereof to into ere with or hinder the building of furnaces side by sidewith their side walls in contact.

A still further object of my invention is to locate the main supplconduit directly beneath the lower lead 0 the grate and to partitionsaid conduit from said leald by plates directly beneath said lead, thusenview taken through one side of the abling the heightof the from to formono, mnuneinssxonon no man mommamama, A o. sromrron onnmmols.

to n of said conduit 'to be reduced to the minimum.

Another object is to deliver the the vertical conduits directly into thespace between the grate leads and to seal the compartments into whichsaid space is divided transversely by members beefing against therespective ate leads.

The invention cons" s further in thematters'hereinafter described andmore portionlarly set forth in the following claims.

In the occompanyingdrawin r Fig. 1 is a longitudinal vertidel sectionview ofa chain grate stoke! furnace embodping the features of myinvention;

Ij1g. ills a. transverse vertical sectional" view taken on line 2+2 ofFig. 1;

Fig. 3 is an enlurged-verticaleeetionnl furnace, the damper being shownopen; 7 Fl gund 5 are perspective views of" detai s of construction tobe hereinafter described; and i Fig. 6 is a horizontal sectional viewtaken on line 6-6 ofFig. '1.

. of the type embodying a mechanical stolrer,

such as a chain grate 1 located in thefcombustion chamber of the furnaceand, hnvi upper and lower leads 2 and 3. Said grate 1 extends into saidcombustion chamber through the front wall of the furnace end has itsrear or tailend terminating. rt. of the bridge wall 4 to provide a ve'rtcal passage throughwhich ash is discharged the tail. end of the grateinto a hopper (not shown) below the'grate as in furnaces of this generalt pe. At the front of the furname is a fuel hopper 5 through which freshfrom or green fuel is fed into the combustion chamber and onto the upperlead 2, which carries the fuel in a layer through the combustion chamberfor consumption, as obvious. The grate 1 extends horizontally bet-weenthe side walls 6, 6 of the furnace setting, as shown in Fig. 2, andthese walls each. in elude a, plurality of upright metal stools 7, 7 atthe o posite sides of the grate. The stools 7, 7 in each wall, arelaterally spaced apart the same distance and, irrthe perticular furnaceillustrated, there are four of such stools 7 in each side wall, with thestools in one wall aligned with those in the opposite wall, is shown inFi 6. Said cured to the stools 7, 7 in line wi h th upr ad ofthe frames9, 9 are channel bars I. Said bars 11 extend along the side ed of theupper grate lead 2 an have low I y extendin flanges on which the sidesof the grate, lelih ustably mounted on them, ledge plates 12. lh'e doorframes .9 are spaced outward from the side edges of the grate, andextending between them and the bars 11 are lates 18, 13. These alsoextend between t e stools 7, 7, between which they are located, andclose the spaces between the door frames 9 and bars 11, as shown inFigs. 2 and 3. The furnace floor 8 extends beneath the lower lead 8 andtogether with the structure to be hereinafter described forms an airsufppllly e "conduit 14 extending the full width 0 stoker 1. In thefurnace shown the door frames '9 extend below the level oi the lowerlead 8 and metal plates 15 close the spaces between the-lower margins ofsaid frames Send the floor 8. W

By the construction described, a plurality of vertical ducts 16, 16, 16are provided on opposite sides of the grate 1 and all of these ductscommunicate at their lower ends with the conduit 14, which is common tothey; all and arranged between them, as shown in Fig. 6? The verticalducts' 16, 16 are closed attheir upper-ends by the plates 13, and jopeninto the space between the grate leads 2 and 8 at appeal hides of thefurnace.

Thisaspuce *is divided; trunsve fi'flly mtoa plurality Ipf compartments17, 17, equal in numberto' the vertical ducts or passages 16, 16 at oneside of the grate and communicatingwith them. To accomplish this I makeuse ofisupporting skids or rails 18 for the uppergratelead 2'. Theseskids 18 are loternlly spared apart. and extend lengthwise .oftliegh'nte 1 beneath the upper lead 2, as shown. grate-between the upperand lower leads 2, 8, are a 'pluru'lity of vertically arranged channelmembers 19. 19. These are 'alinged with the several stools 7, 7 and aresupported thereby, as shown-in dotted lines in Fig. 3. Sold members 19,19 fit. against the un der sides of the skids 18. and hctwccn them andthe under side of tho lop lead 2 are a plurality of memlwrs 20 shaped asShown in Fig. 1. Fold members 20 r-xtonrl hetwovn and are supported bythe skills 18 to close.

7 with the under side of the top ea 2 rest. These bars 11 have ad- 'tbExtending transversely across the.

under sideof the top lead 2 .and thus provide air seals-between theseveraleom ments 17 17 along the upper lead 2. over, sai me 20 have wiin 2 so as not to hinder the front to the rear of the furnace.

As shown in Fig. 1, the members 19 terminute short of the bottom lead 8,and for closing the spaces between such parts, 1 pro vide a plurality ofsectional members 21, 21. on the upper surface of the bottom lead 8 andhave wiping contact therewith so as not' to interfere with the movementof that lead during the operation of e grate. Said members 21 aresuspended from the members 19 -by having their hooked upper ends engageover angle plates 22 carried by the members 19, as shown. The members 21are slid endwise on the angle members 22 in the installation or thefurnace and are held in substantiall tight contact with each other byend bra eta 2B, 23- adjustably secured by bolts and elongated slots tothe sides of the 2 and 8.

By having the members 21 hooked over the supporting bars 22, saidmembers21 ma be raised upward by the droppage carri under them by the bottomlead 3, and to prevent the members 21 be moved by the droppage oil" ofsaid bars 22 provide guard .plates 24 extending over the hooked ends ofthe members 20, as shown in Figs. 1 and 3. These plates 24 are suitablysecured to the cross-beams 19. The members 20 and 21 hearing against thetop and bottom leads of the grate 1 provide air seals between. thevarious comdpartments 17 formed by said members an the beams 19 andprevent one compartment leaking into the other when placed under draftfrom the main supply conduit 14;

Arranged beneath the lower lead 8 are skids or rails 25. These extendsubstantially. the full length of the grate and support said bottom lead3. Between said skids 25 extend metal plates 26.26. These form a'roof ortop wall for the conduit 14 and divide the some from the lower lead 3.Said plates 26 Where they engage the skids 25 have their side edges bentto rest on and conform to the base flanges of said skids, as

shown, to provide an air seal between the plates and skids. Theoutermost lobes 26 at each side of the grate 1 have t eir side edgesflanged upward, as at 27. and these' flanges are secured to members 28extending between the several stools 7, as clearly shown in l igs. 2 and3. These members 28 are mnrlc of cast metal and tho lower lead 3 restson them. Between the flanges 27 and tho momliors 28 an u'onr bars 29made of steel. This lulws ihc friction of the lower contact"- movementthereof from the stools -7, as shown in l6 verse members 19 an aresupported lead and saves-tha'membors 28 from wearwiththe stools 7 iorminorthe intermediate duct 1 rear end of this shaftisj as shown in Flg. 1..o tubular and is not Said shaft 38 etback to and in line orming the rearsides of glintfi s 43, 43, with the mp'er plates 34, as shown in f eachof these shifts elarm 45, and pivoted rods 46, 46, one for e rods 46 arepivot ght operating levers ctively, .8 shown in- Ievers have suitablelatch in connection with as shown in Fi r 6 any of theirse mifdownbeyond the bars 29 lower stantially vertical alifmnent with the transthends by webs 32 onfthe stools 7 The grate 1 in indoor con to lead 2.. vi 35 e con'duit14 beneath the stoker is com- For contra mg theadmittance of as shown in igs.'.2.and 3; are hinged to stools 7 belowthe parts 28 and are adapted tol-be swung from a position closing theiggf 16 at spaces between the members 28 and the both 'tom'walls '15 ofthe vertical air ducts'16.

ch vertical duct 16h'as one of these gg ggj f 3 the ducts 16 to becutout or supplied with fifi i fi 47 is a m a e lates 34.

F or actuating the dampers 34,1 employ g g g g g 14 to flow three shafts36, 37, and 88. These extend c'ompartment 7 and intothe conduit 14 froma point outsidethe f l layer under f c as out of the furnace andthrougna vertical dampers 84, thereby permitting any one of air to theextent? desired.

the conduit 14, as shown in Fig. 1.

coated on themembers 28 are a'nglabdrs 12?. 6. Th 80.- These-form ledgeplatmfor the lower n ed in a I lead a and extend between the stools 1and The next shaft as is ab are adjustnbly secured by a bolt and slot aslong connection to the members 28 so that they tends into the conduit 14"mag be adl'uated against the side edges of with the stool 7' f sai end3 to rovide an air seal bethe forward verti tween the lower lea and :themembers 28;. nal

The skids am supported fminbelow by "is' provided with two In aplurality of tran verse members ,81, ae.-which are connec d by clearlyshown in Fig.1. These are 111 subassociated do as the one 87.

d in a bracket 42. Eae

at At the outer end 0 v shown in 86, 3'1, and 38 is a radi Fig. 3. Theplstes'26 extend between these t the are connectin members 81 and theskids 25. Toolbar: the h f id arms, spaces'betweentheplatesQfi and theunder ally connected to upri 2. surface of the lower lead 3 in line withthe ,4! 48, and 49, respe members 19, I provide a plurality of memxFig.Th

bars 83. These are secured "in place-in any members o erafti suitablemanner and bear against the under at h d e t Side of the bottom lead- 3in somewhat the f H ldi th zo'same mannerasfio the memblier: 21.positions f dj st t.

p lifld'lmkfi a The conduit 14 may be on parts th .& ga g between fromany suitable source a customs in chain grate construction, and, f ndmanner, as, an ai in prev s l h' 9' shown two blowers 51 1 one p 17 tomother tric motors 52,52 for hi th ro h the'lower lead 8, the chambersparts are arranged at the forum between th 'd d P11111593 conduit 14 andforward of t fill with ash from theudmppage through the The '.b1 w gthaoughfitlllris wall e nace struc mon to all-of thevertical ductslfieand also, 1 n to all of the coin artments 17 formed be-- fifi g flffto but in thejdrawin' into the furna'c front endof t u h the toniimsmionchamber of the grate. ed for aidin iecl tothe conduit under side of theanyone or all of the vertie sides of the desired to 511 p y a draft toed, that is, the fuel tween the to and ttom le'ads of the ate. happen 5at 1% i isfl-carriiadthrd 11 1t0 theseseyeral compartments 17; I proin alayer on indaa pluralit of damper plates 34. These, To Suppl-y draft wt9 fuel b mem'bers 35-sxtend1iqfibetween the several gg i fi gg a 11 ofthe fuel jacent the place of..

front compartment 1 the open the fore-- his allows air 'into the firstaces the inc 1 Should it be desire plate 39 extending across the frontof the g' iddl sect) conduit 14 and closin it at the front of the i th fl b d we iurhacm. These 'sha ts are telescoped and 17, th h d the one 36extends, the full length of the p n the damper 3 conduit 14; that'is, itextends from the front a d air i pplied ofthe' furnace back to the rearend of said of th in conduit. The rear end of said shaft 36 is (in theother hand, should it journaled in a bracket 40 at the rear end ofsupply the last of the fuelbed the hand lever 49 is o erated The nextshaft 37 extends back to and in rearmost dampers 3i sides ied with air pher by elecurpose. nt end of the he firgnt wallpen into tlije'Icon'duit14.- supplying air thereto.

hown. and do Fresh or green through the grate and oming d to supply airto the n of the fuel bed, that r the middle compartlever 48 is operatedto 4 for that compartment ereto from both mace through the midbe desiredto with a draft, to open the hould it be desired 130 the rear sides asshown '11:

to cut out any of these compartments 17and allow any of the others to beopened to draft, the damper plates r the articular compartments to bedose are "c osed and those to be opened are opened through the leversfor that or those compartments, as isap arent. i

us during the operation ofthe furnace, e1ther the entire rate surfacemay belilnced under forced dra t, or any section orseol'rions thereof,as may be desired. Maniiestlj the fuel bed may be placed under that:most suitable to gain proper and economical consumption of fuel andthese draft-conditions may be made suitable to the nattiiie oi the fuelbeing handled and also on of fuel feed. It is to be observed that theconduit 1d common to all of the ducts 16, 16 at'both sides of the grate1, and further that the communication of each duct 16 with the conduit14 is of the full width of the duct 16 and also that the latter is thefull width of the compartment 17 which it supplies,

-This allows supplying air to the grate at an even and substantiallycontinuous flow without high velocity and thus avoids blowing holes inthe fuel bed b the drattbeing forcedtoo rapidly throng it. Furthermore,

the entire grate surface covering such comartment '17 isplaced underdraft throu h |ts,en;tire extent or area, thus dining a equate andcomplete supply of air to the fuel bed sections over such areas.Moreover, by having the-conduit 14 common to all of the vertical ducts16, the pressure in the conduit 14 may be maintained constant and atthat degree most suitable to secure an even and gentle flow of draftregardless of the number of ducts 16. Then a uin, having the conduit 14beneath the stoccr l and its communication with the upper chain load 2around the sides of the stohcr, avoids leading the draft into the stokerthrough the side walls oi the furnace from points exterior, thusreducing the width of the-furnace to the minimum: and cnablin the sameto be built in buttery form as t u-re are no arts of the draft structureprojecting bcyon the sides of u stoker to interfere with or preventthat. Agiiin, by having a single supply con duit I4 and that common toall of the ducts 18, ovoidstbc expense of building and use of separatesupply conduits for the various vertical ducts 16, as heretofore. Otherand further objects of my invention will be a parcut to those skilled inthe art to whic my invention relates.

While I-hurc shown and described herein in detail a structure embodyingthe features of my invention, it is of course to be understood that thedetails of construction and arrangement of parts may be variouslychaugcd and modified without departing from' the spirit and scope of myinvention.

. g alieing ppqsi the ,oorrespon 'lead under a draft.

4. In a'furnaee, the combination of an .endless chain grate having up orand lower I claim as my invention:

1, In agfurnace, the combination of a to a plurality of air-ducts on oposite si es 0 said, opeiningbenezit fthe fuell suprtmfi ionosai e orsuvereto, the ducts a t one side b ffi I 1 8.111% ducts Ql1 fill--0ll1lf$ldli0f said grate, a sing e'-con'- that grate and between thesome it des-thereof and conduit being common to'a'll oi. said acts forsupplying 'a'ir thereto, a damper for each duct, 1 pluralliby of shaftsbetween said ducts, one for each set of op ice ducts, and meanscannectmgeach ft with the dampers of its :gwoiated ducts so'that-thedampers of one oi ducts may be actuated of odern rsof algother set.

In a mace, e combination of an endless chliglgrate having upper andlower leads a pl it of beams extending transve I v across t a spacebetween said leads for dividing said 8 see into a plurality ofcompartments, mem ,zassociuted with said beams and extending onoppositesides thereof, said members being in contact with said upper and lowerleads, respectively, for provi 'ng air seals between said com artmenlzsalo said beams, a single conduit beneath the ower lead and common to allof said compartments, and means for sup lying air to said com artmentsfrom sin around the si es of said lower lead.

3. In a furnace, the combination of an endless chain grate having upperand lower leads, skids extending longit'u inally of said grate beneaththe upper lead for supporting the same, beams extendin transverselyacross the space between sai lendsv for dividing said space into aplurality of compartments, said. beams bein against the under sides ofsaid skids, mem ers associated with said beams and bearing a -'nst saidupper and lower leads, respective y, for prong air sealsbetween saidcompartments aloniesaid leads, the uppermost oi. said mem said beams,and means for supplying air to said compartments for placing the upperleads, skids exten grate beneath said upper lead for supportmg the same,beams extendin transversely across the space between sai leads fordividing said ace into a plurality of coinpartments, said beams engagingthe under sides of said skids, membersnssociuted with said beams andengaging against the upper and lower leads, respectively, for providingair seals between said compartments along said bcanls, thelowermost ofsaid members being mounted on said beams in a manner conduit rsextending between said skids forclosingthe spaces between the'same alongding longitu mally of said i ependently met-most rmitting said membersto be raised by. lyfipage carried under them or said lower Q a partmentsaround said for placing the u per-mitt raising of said members b dropage cai rl ed under by said lowzr' lea d, an means for supalgmg air tosaidtcom- Sldfifl of said lower per'lead under dra In a furnace,e'eornbination of an endless chain grete having up r and lower leads,skids extending lon'gitu innlly' of saidgrate beneathv said upper leadfor support-- mg the same,:beams ,extepdi transversely across the space.between sai leads "for "de riding said s see into a plurality ofcompartments, said, beams engaging th'e under sides of said skids,members assoeiated with said beams and en against the it per and lowerleads, vey, for provi mg air seals between 1 1 compartments, meansvidinge hooked connection between the of ssid'me'mbem and said beamsmeans limiting ,the raising of said members byseid droppage, and meansfor supplying air to said compartments around the sides of said lowerleadfor placing the upper lead under draft. 1

.6. In a furnace, the combination of an endlessehaimgrate having upperand lower leads, stools it the sides o as: Erato, beams extendingtransversely across t e space between said; leads for dividing saidspace into a pldrality of compartments, .menns associated with the upperportions of said,

beams and Jen said upper le tor presiding air seals between'ssidcompartments along the to? of said beams, an anfilo plate secure to thelower rtion 0 each beam, a plurality of co members hooked over saidangle plates: and b'earingdownward against the up r surface of saidlower lead, mem- -bers justably mounted on said stools at the ends ofand beams for. keeping the interposed'shoe members in contact with eachother, and means for supplging air to said compartments around the si esof ,said lower lead 10: placing theupper. lead under 7. In I, furnace,the combination of an endless chain to having upper. and lower leads,uprigh stools stone side of said grate, members extending between saidstools alon the side edgs of said upper and lower lea and supporting thesome, ledge it, artments openin ging the under side of in draft.

plates adjustably mounted on said members or the respective grate leads,means between said leads for dividing the space therebetween into aplurality of transrerse eom cad, door frames carried by said homes forclosin the opening's therein, a single conduit lower lead and common toall ofsaid com- Hlartments for supiplying air thereto, means 'vidisaidcon nit from said lower lead, lstes tween said stools and extendingrom saidfremes to upper ledge plate supports and the door of saidconduit, respectively, for providing air diicts from saidcondult to saidcompartments, dampers hinged to the lower ledge plate supports, one foreach duct, and means for actuating said dampers.

8.-In1 a furnace, the combination of a grate havin a traveling portion,stoolset the sides 0 said grate, members between said-stools andextending under side edges of said traveling grate portion for supportupward to said \1' per tween said stoola: oors 0 said 1 ing the some,said members being of cast metal, and wear strips of harder metslsecuredto said cast members and on supplying-air thereto, the ductson-one'side' so of said grate beingeopposite the ductson the other sidethereof, a hinged' damper for each duct, a lurality of shafts of variouslen hs exten ing into said conduit betweenv ,eoi ducts, said shaftsbeing telescoped on each other and arranged one for each set at toducts, means connectinieweh shaft h the am ers of itsopposi ducts foropening and c osm the same, and means for actuetingsaid sh ts andindependently of each other. testimony that! claim the fore ing as myinvention, I atlix my'signntnre t 's 10th day of December, A. D. 1921,

HERMAN A. rorrssnosssi.

